Chae Won found out that Baekhyun, the pretty boy is an ex-confict. Baekhyun couldn't remember what he had committed. One day Baekhyun used a binyeo (hairpin) to defend Chae Won from thieves. The binyeo was the last gift Chae Won's father gave her before turning himself in to the police.  However, things started to get complicated when Kris discovered The Notebook----- a daily journal that Chae Won and Baekhyu

Jonghyun was once a bullied student, but later turned out to be a bully. Minho was once a bully, and turned out to be a bullied student instead. It all changed in high-school, where society flipped people to someone they didn't even dream to be.